5470 - Newton's Second Law

Which is the equation for net force on this box?

• F_net = (F₁+F₂)/a

• F_net = F₁ - F₂

• F_net = F₁*F₂

• F_net = F₁ + F₂

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NGSS.HS-PS2-1

This block is started from rest. Which pair of graphs best demonstrates the motion that would result from this net force?

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• 

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NGSS.HS-PS2-1

A shopping cart is pushed frictionlessly such that its acceleration is a. If the net force on the cart doubled, then

• a would be 1/2 of its original value.

• a would be equal to its original value.

• a would be twice as large as its original value.

• a would 2² = 4 times as large as its original value.

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NGSS.HS-PS2-1

A shopping cart is pushed frictionlessly such that its acceleration is a. If more items were added to the cart so its mass doubled, then

• a would be 1/2 of its original value.

• a would be equal to its original value.

• a would be twice as large as its original value.

• a would 2² = 4 times as large as its original value.

Tags

NGSS.HS-PS2-1

A bowling ball is dropped from rest inside a vacuum chamber such that there is no air resistance. The ball falls with an acceleration of a. If the mass of the ball doubled, how would the acceleration change?

• The acceleration would double to 2a.

• The acceleration would stay the same a.

• The acceleration would decrease to 1/2 a.

• Not enough information

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NGSS.HS-PS2-1

The net force in this case is

• -2 N left

• 12 N right

• 16 N right

• F_N depends on the mass of the block

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NGSS.HS-PS2-1

In order to calculate the acceleration, a, in this scenario, you would need

• no other quantities - you have all the info needed to calculate a.

• the mass only

• the net force only

• the mass and normal force

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NGSS.HS-PS2-1

A person with a weight of 650N stands in an elevator on a scale. Calculate the approximate mass of the person.

• Depends on the acceleration of the elevator.

• 6.5 kg

• 65 kg

• 650 kg

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NGSS.HS-PS2-1

A person with a weight of 650N stands in an elevator on a scale. In which picture, if any, does the scale have a reading of 0 Newtons?

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• None, the scale always reads something because the F_g of a person is never zero near the surface of the Earth.

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NGSS.HS-PS2-1

A student pulls a box across a table until it starts moving and then pulls at a constant velocity yielding the graph, right. Identify the kinetic friction force.

• 3 N

• 5 N

• 6 N

• 8 N

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NGSS.HS-PS2-1